In addition to @idi527 , here’s my Webpack 2 config (but using Phoenix ~1.2). In 2017, hot module reload is required. I don’t know how people develop without it.

Hopefully it helps someone.

const CopyWebpackPlugin = require("copy-webpack-plugin");
const webpack = require('webpack');
const path = require('path');
const publicPath = 'http://localhost:4001/';

const config = {
  entry: [
    'react-hot-loader/patch',
    // activate HMR for React

    'webpack-dev-server/client?' + publicPath,
    // bundle the client for webpack-dev-server
    // and connect to the provided endpoint

    'webpack/hot/only-dev-server',
    // bundle the client for hot reloading
    // only- means to only hot reload for successful updates
    "./web/static/js/app.js"
  ],
  output: {
    path: path.resolve(__dirname) + "/priv/static/js",
    publicPath: publicPath,
    filename: "bundle.js"
  },
  devServer: {
    hot: true,
    port: 4001,
    // enable HMR on the server
    contentBase: path.resolve(__dirname) + "/priv/static/js",
    // match the output path
    publicPath: publicPath,

    // match the output `publicPath`
  },
  module: {
    loaders: [{
      test: /\.js$/,
      exclude: /node_modules/,
      loader: "babel-loader"
     
    }]
  },
  resolve: {
    modules: [ "node_modules", path.resolve(__dirname) + "/web/static/js" ]
  },
  plugins: [
    new webpack.HotModuleReplacementPlugin(),
    // enable HMR globally

    new webpack.NamedModulesPlugin(),
    new CopyWebpackPlugin([{ from: "./web/static/assets" }])
  ]
};
module.exports = config;

Most of those you do not need javascript for. I have models, accordions, text input labels transformations all without javascript. I’ve noticed a lot of people use javascript for things that are pretty trivial in CSS, maybe they like the extra slowdown on their pages or something… >.>

Hey, I created this repo GitHub - straw-hat-labs/phoenix_assets_webpack: Asset Pipeline with Webpack on Phoenix · GitHub

Normally I understand how Webpack works and I replace it every time I create a Phoenix project and this is phoenix 1.3 ready actually